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main.go
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main.go
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// Copyright 2017 The Prometheus Authors
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
//
// Copyright 2019 Crunchy Data
//
// Based on the Prometheus remote storage example:
// documentation/examples/remote_storage/remote_storage_adapter/main.go
//
// The main package for the Prometheus server executable.
package main
import (
"fmt"
"io/ioutil"
"net/http"
_ "net/http/pprof"
"os"
"os/signal"
"time"
"path/filepath"
"github.com/crunchydata/postgresql-prometheus-adapter/pkg/postgresql"
"github.com/go-kit/kit/log"
"github.com/go-kit/kit/log/level"
"github.com/gogo/protobuf/proto"
"github.com/golang/snappy"
//"github.com/jamiealquiza/envy"
"github.com/prometheus/common/promlog"
"github.com/prometheus/common/promlog/flag"
"github.com/prometheus/client_golang/prometheus"
"github.com/prometheus/client_golang/prometheus/promhttp"
"github.com/prometheus/prometheus/prompb"
//"github.com/prometheus/client_model/go"
"github.com/prometheus/common/model"
"gopkg.in/alecthomas/kingpin.v2"
//"flag"
)
var Version = "development"
type config struct {
remoteTimeout time.Duration
listenAddr string
telemetryPath string
pgPrometheusConfig postgresql.Config
logLevel string
haGroupLockId int
prometheusTimeout time.Duration
promlogConfig promlog.Config
}
const (
tickInterval = time.Second
promLivenessCheck = time.Second
maxBgWriter = 10
maxBgParser = 20
)
var (
receivedSamples = prometheus.NewCounter(
prometheus.CounterOpts{
Name: "received_samples_total",
Help: "Total number of received samples.",
},
)
sentSamples = prometheus.NewCounterVec(
prometheus.CounterOpts{
Name: "sent_samples_total",
Help: "Total number of processed samples sent to remote storage.",
},
[]string{"remote"},
)
failedSamples = prometheus.NewCounterVec(
prometheus.CounterOpts{
Name: "failed_samples_total",
Help: "Total number of processed samples which failed on send to remote storage.",
},
[]string{"remote"},
)
sentBatchDuration = prometheus.NewHistogramVec(
prometheus.HistogramOpts{
Name: "sent_batch_duration_seconds",
Help: "Duration of sample batch send calls to the remote storage.",
Buckets: prometheus.DefBuckets,
},
[]string{"remote"},
)
httpRequestDuration = prometheus.NewHistogramVec(
prometheus.HistogramOpts{
Name: "http_request_duration_ms",
Help: "Duration of HTTP request in milliseconds",
Buckets: prometheus.DefBuckets,
},
[]string{"path"},
)
)
var worker [maxBgWriter]postgresql.PGWriter
func init() {
prometheus.MustRegister(receivedSamples)
prometheus.MustRegister(sentSamples)
prometheus.MustRegister(failedSamples)
prometheus.MustRegister(sentBatchDuration)
prometheus.MustRegister(httpRequestDuration)
}
func main() {
cfg := parseFlags()
logger := promlog.New(&cfg.promlogConfig)
level.Info(logger).Log("config", fmt.Sprintf("%+v", cfg))
level.Info(logger).Log("pgPrometheusConfig", fmt.Sprintf("%+v", cfg.pgPrometheusConfig))
if cfg.pgPrometheusConfig.PGWriters < 0 {
cfg.pgPrometheusConfig.PGWriters = 1
}
if cfg.pgPrometheusConfig.PGWriters > maxBgWriter {
cfg.pgPrometheusConfig.PGWriters = maxBgWriter
}
if cfg.pgPrometheusConfig.PGParsers < 0 {
cfg.pgPrometheusConfig.PGParsers = 1
}
if cfg.pgPrometheusConfig.PGParsers > maxBgParser {
cfg.pgPrometheusConfig.PGParsers = maxBgParser
}
http.Handle(cfg.telemetryPath, promhttp.Handler())
writer, reader := buildClients(logger, cfg)
c := make(chan os.Signal, 1)
signal.Notify(c, os.Interrupt)
go func() {
for sig := range c {
fmt.Printf("Signal: %v\n", sig)
for t := 0; t < cfg.pgPrometheusConfig.PGWriters; t++ {
fmt.Printf("Calling shutdown %d\n", t)
worker[t].PGWriterShutdown()
}
for t := 0; t < cfg.pgPrometheusConfig.PGWriters; t++ {
for worker[t].Running {
time.Sleep(1 * time.Second)
fmt.Printf("Waiting for shutdown %d...\n", t)
}
}
os.Exit(0)
}
}()
for t := 0; t < cfg.pgPrometheusConfig.PGWriters; t++ {
go worker[t].RunPGWriter(logger, t, cfg.pgPrometheusConfig.CommitSecs, cfg.pgPrometheusConfig.CommitRows, cfg.pgPrometheusConfig.PGParsers, cfg.pgPrometheusConfig.PartitionScheme)
defer worker[t].PGWriterShutdown()
}
level.Info(logger).Log("msg", "Starting HTTP Listerner")
http.Handle("/write", timeHandler("write", write(logger, writer)))
http.Handle("/read", timeHandler("read", read(logger, reader)))
level.Info(logger).Log("msg", "Starting up...")
level.Info(logger).Log("msg", "Listening", "addr", cfg.listenAddr)
err := http.ListenAndServe(cfg.listenAddr, nil)
level.Info(logger).Log("msg", "Started HTTP Listerner")
if err != nil {
level.Error(logger).Log("msg", "Listen failure", "err", err)
os.Exit(1)
}
}
func parseFlags() *config {
a := kingpin.New(filepath.Base(os.Args[0]), fmt.Sprintf("Remote storage adapter [ PostgreSQL ], Version: %s", Version))
a.HelpFlag.Short('h')
cfg := &config{
promlogConfig: promlog.Config{},
}
a.Flag("adapter-send-timeout", "The timeout to use when sending samples to the remote storage.").Default("30s").DurationVar(&cfg.remoteTimeout)
a.Flag("web-listen-address", "Address to listen on for web endpoints.").Default(":9201").StringVar(&cfg.listenAddr)
a.Flag("web-telemetry-path", "Address to listen on for web endpoints.").Default("/metrics").StringVar(&cfg.telemetryPath)
flag.AddFlags(a, &cfg.promlogConfig)
a.Flag("pg-partition", "daily or hourly partitions, default: hourly").Default("hourly").StringVar(&cfg.pgPrometheusConfig.PartitionScheme)
a.Flag("pg-commit-secs", "Write data to database every N seconds").Default("15").IntVar(&cfg.pgPrometheusConfig.CommitSecs)
a.Flag("pg-commit-rows", "Write data to database every N Rows").Default("20000").IntVar(&cfg.pgPrometheusConfig.CommitRows)
a.Flag("pg-threads", "Writer DB threads to run 1-10").Default("1").IntVar(&cfg.pgPrometheusConfig.PGWriters)
a.Flag("parser-threads", "parser threads to run per DB writer 1-10").Default("5").IntVar(&cfg.pgPrometheusConfig.PGParsers)
_, err := a.Parse(os.Args[1:])
if err != nil {
fmt.Fprintln(os.Stderr, "Error parsing commandline arguments")
a.Usage(os.Args[1:])
os.Exit(2)
}
return cfg
}
type writer interface {
Write(samples model.Samples) error
Name() string
}
type reader interface {
Read(req *prompb.ReadRequest) (*prompb.ReadResponse, error)
Name() string
HealthCheck() error
}
func buildClients(logger log.Logger, cfg *config) (writer, reader) {
pgClient := postgresql.NewClient(log.With(logger, "storage", "PostgreSQL"), &cfg.pgPrometheusConfig)
return pgClient, pgClient
}
func write(logger log.Logger, writer writer) http.Handler {
return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
compressed, err := ioutil.ReadAll(r.Body)
if err != nil {
level.Error(logger).Log("msg", "Read error", "err", err.Error())
http.Error(w, err.Error(), http.StatusInternalServerError)
return
}
reqBuf, err := snappy.Decode(nil, compressed)
if err != nil {
level.Error(logger).Log("msg", "Decode error", "err", err.Error())
http.Error(w, err.Error(), http.StatusBadRequest)
return
}
var req prompb.WriteRequest
if err := proto.Unmarshal(reqBuf, &req); err != nil {
level.Error(logger).Log("msg", "Unmarshal error", "err", err.Error())
http.Error(w, err.Error(), http.StatusBadRequest)
return
}
samples := protoToSamples(&req)
receivedSamples.Add(float64(len(samples)))
err = sendSamples(writer, samples)
if err != nil {
level.Warn(logger).Log("msg", "Error sending samples to remote storage", "err", err, "storage", writer.Name(), "num_samples", len(samples))
}
})
}
func read(logger log.Logger, reader reader) http.Handler {
return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
compressed, err := ioutil.ReadAll(r.Body)
if err != nil {
level.Error(logger).Log("msg", "Read error", "err", err.Error())
http.Error(w, err.Error(), http.StatusInternalServerError)
return
}
reqBuf, err := snappy.Decode(nil, compressed)
if err != nil {
level.Error(logger).Log("msg", "Decode error", "err", err.Error())
http.Error(w, err.Error(), http.StatusBadRequest)
return
}
var req prompb.ReadRequest
if err := proto.Unmarshal(reqBuf, &req); err != nil {
level.Error(logger).Log("msg", "Unmarshal error", "err", err.Error())
http.Error(w, err.Error(), http.StatusBadRequest)
return
}
var resp *prompb.ReadResponse
resp, err = reader.Read(&req)
if err != nil {
fmt.Printf("MAIN req.Queries: %v\n", req.Queries)
level.Warn(logger).Log("msg", "Error executing query", "query", req, "storage", reader.Name(), "err", err)
http.Error(w, err.Error(), http.StatusInternalServerError)
return
}
data, err := proto.Marshal(resp)
if err != nil {
http.Error(w, err.Error(), http.StatusInternalServerError)
return
}
w.Header().Set("Content-Type", "application/x-protobuf")
w.Header().Set("Content-Encoding", "snappy")
compressed = snappy.Encode(nil, data)
if _, err := w.Write(compressed); err != nil {
http.Error(w, err.Error(), http.StatusInternalServerError)
return
}
})
}
func health(reader reader) http.Handler {
return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
err := reader.HealthCheck()
if err != nil {
http.Error(w, err.Error(), http.StatusInternalServerError)
return
}
w.Header().Set("Content-Length", "0")
})
}
func protoToSamples(req *prompb.WriteRequest) model.Samples {
var samples model.Samples
for _, ts := range req.Timeseries {
metric := make(model.Metric, len(ts.Labels))
for _, l := range ts.Labels {
metric[model.LabelName(l.Name)] = model.LabelValue(l.Value)
}
for _, s := range ts.Samples {
samples = append(samples, &model.Sample{
Metric: metric,
Value: model.SampleValue(s.Value),
Timestamp: model.Time(s.Timestamp),
})
}
}
return samples
}
func sendSamples(w writer, samples model.Samples) error {
begin := time.Now()
var err error
err = w.Write(samples)
duration := time.Since(begin).Seconds()
if err != nil {
failedSamples.WithLabelValues(w.Name()).Add(float64(len(samples)))
return err
}
sentSamples.WithLabelValues(w.Name()).Add(float64(len(samples)))
sentBatchDuration.WithLabelValues(w.Name()).Observe(duration)
return nil
}
// timeHandler uses Prometheus histogram to track request time
func timeHandler(path string, handler http.Handler) http.Handler {
f := func(w http.ResponseWriter, r *http.Request) {
start := time.Now()
handler.ServeHTTP(w, r)
elapsedMs := time.Since(start).Nanoseconds() / int64(time.Millisecond)
httpRequestDuration.WithLabelValues(path).Observe(float64(elapsedMs))
}
return http.HandlerFunc(f)
}